Bed sale: Get a metal bunk bed. Twin sleeper: Perfect addition to your child's bedroom when you need to save some space. Upgrade: Option to include a mattress. Mattress: A supportive and hypo-allergenic filled mattress with medium strength springs. Great for: Siblings or sleepovers with friends! Size: Top and bottom bunks are both standard 3ft single beds. | Metal Bunk Bed w/ Mattress Option | Wowcher